from the Galapagos Islands. 33 
Mandibles short and. obtuse, bidentate at the extremity, and 
hidden by the clypeus, when the head is viewed from above. 
Mentum small, ovate, concave externally. 
Mazillary palpi moderate ; the terminal jomt securiform: Jabial 
palpi short ; the terminal joint swollen. 
Head considerably narrower than the thorax; the visible portion 
broader than long ; the fore-part im front of the eyes forms 
nearly a semicircle, but is emarginated in front ; no indentation 
marks the posterior or lateral boundaries of the clypeus: the 
lateral ridge of the head, which protects the basal portion of 
the antennz, is well-developed, and runs backwards so as to 
divide the eye into two parts; the upper portion of the eye is 
rather large and round, or very nearly so ; the lower portion is 
nearly of equal size with the upper, and also nearly round. 
Antenne moderate ; if extended backwards would reach the base 
of the thorax ; the joints of a shortish obconic form ; the se- 
cond joint short ; the third nearly as long as the two following 
taken together ; the last three joints incrassated, and fully as 
broad as long ; the terminal joint is round, and as large as the 
penultimate. 
Thorax subquadrate, but little broader than long, emarginated in 
front, and with the anterior angles rather prominent and some- 
what acute ; the sides are indistinctly rounded, and the hinder 
part is but little broader than the front ; the posterior margin 
is distinctly bisinuated, and the posterior angles are nght 
angles, or somewhat acute: the surface is moderately convex, 
and there is a distinct impressed line running parallel with, and 
close to, both the lateral and posterior margins. 
Scutellum distinct, triangular. 
Elytra soldered together, oblong, convex, rounded at the extre- 
mity: the humeral angles nearly right angles, but somewhat 
obtuse, and presenting a slightly concaye triangular surface m 
front, against which the thoracic angles are applied. 
Presternum rather contracted, pointed behind, and but little pro- 
duced beyond the coxz of the anterior legs. 
Abdomen with the penultimate segment very narrow in the antero- 
posterior direction; the last segment semicircular and depressed, 
or concave, in the middle. 
Legs moderate ; the tibie straight, very little compressed, and but 
slightly dilated at the apex: the four anterior tarsi dilated in 
the male sex, the anterior pair distinctly so, the width of the 
second or third joint being nearly equal to the length of the 
four basal joints taken together ; the first and fourth joints are 
small, the second and third equal or very nearly so; the three 
basal joints only appear to be covered with the velyet-like sub- 
stance beneath: the middle pair of tarsi are less distinctly di- 
Ann. & Mag. N. Hist. Vol. xvi. 
